CN-116323240-B - Transfer film, plastic injection molded part and method for producing same

Abstract

The invention relates to a method for producing a transfer film (1), in particular an IMD transfer film (1), wherein the following steps are carried out, in particular in the order given, a) a carrier layer (3) is provided, b) a transfer layer (2) comprising a decorative layer (21) is provided, wherein the transfer layer (2) is or is to be arranged on the carrier layer (3), c) one or more molding elements (40) are applied to the carrier layer (3), wherein the one or more molding elements (40) have a three-dimensional shape and are applied in precise register with the decorative layer (21). The invention also relates to a method for coating a plastic injection molded part with a transfer film, and to a transfer film and a plastic injection molded part.

Inventors

• One method S Na
• C sues
• S. Oberdfeld

Assignees

• 雷恩哈德库兹基金两合公司

Dates

Publication Date

20260512

Application Date

20210715

Priority Date

20200806

Claims (20)

1. 1. A method for manufacturing a transfer film (1), wherein the following steps are performed: a) Providing a carrier layer (3), B) Providing a transfer layer (2) comprising a decorative layer (21), wherein the transfer layer (2) has been arranged on the carrier layer (3), or providing a transfer layer (2) comprising a decorative layer (21) and arranging the transfer layer (2) on the carrier layer (3), C) Applying one or more profiled elements (40) onto the carrier layer (3), wherein the one or more profiled elements (40) have a three-dimensional shape and are applied in precise register with the decorative layer (21), Wherein in step c) at least one of the following printing methods is performed: -applying one or more layers of the one or more profiled elements by means of intaglio printing and/or flexographic printing and/or screen printing; -applying one or more first layers of said one or more profiled elements (40) by means of a digital printing method; -applying the layer of the one or more profiled elements (40) applied last in step c) using a digital printing method; applying the one or more profiled elements (40) by means of 3D printing, The method further comprises the steps of: b1 Providing in the transfer layer (2) a masking region (72) which does not overlap the one or more profiled elements (40) and a viewing region (71) which is arranged overlapping the one or more profiled elements (40) at least in part of the region, For one or more of the decorative layer (21), the visible region (71) and/or the masking region (72) corresponding mating marks are applied to the respective layer, and in a subsequent step the one or more profiled elements (40) and the associated mating marks are applied to the carrier layer (3) on the side opposite the transfer layer (2), The transfer layer being transparent to light visible to the human eye in the visible region and having a transmittance of greater than 75%, the transfer layer being opaque to light visible to the human eye in the occluded region, wherein the opacity means having a transmittance of 0% to 10%, and The one or more profiled elements have a constant layer thickness at least in the visible region.
2. 2. Method according to claim 1, characterized in that the transfer layer is applied on a first side of a carrier layer or the transfer layer (2) is applied on a first side of a carrier layer (3) and the one or more profiled elements (40) are applied on a second side of the carrier layer (3) opposite to the first side.
3. 3. The method of claim 1, wherein the one or more molding elements (40) form one or more patterns.
4. 4. A method according to any one of claims 1 to 3, characterized in that the one or more profiled elements (40) are mechanically stable and/or have a glass transition temperature of more than 200 ℃.
5. 5. A method according to any one of claims 1 to 3, characterized in that in step c) the one or more first layers of the one or more profiled elements (40) are applied by means of an inkjet printing method.
6. 6. A method according to any one of claims 1 to 3, characterized in that the layer of the one or more profiled elements (40) that is applied last in step c) is applied using an inkjet printing method.
7. 7. A method according to any one of claims 1 to 3, characterized in that in step c) two or more layers of the one or more profiled elements (40) are applied overlapping each other.
8. 8. A method according to any one of claims 1 to 3, characterized in that at least one of the one or more profiled elements (40) has a layer thickness in the range of 1 μm to 200 μm.
9. 9. A method according to any one of claims 1 to 3, characterized in that the registration tolerance between the one or more profiled elements (40) and the decorative layer (21) is in the range of 0.05 mm to 1.0 mm.
10. 10. A method according to any one of claims 1 to 3, characterized in that the decorative layer (21) has one or more decorative elements (210) applied by means of one or more layers selected from one or more colored layers, one or more reflective layers, one or more optically active and/or optically variable structures.
11. 11. A method according to any one of claims 1 to 3, characterized in that in the step b 1) a visible region (71) is produced in the transfer layer (2), said visible region having a higher transmittance than the masked region (72), and/or the masked region (72) is formed by means of the masking layer (22) in such a way that the masking layer (22) reduces the transmittance of the transfer layer (2) in the masked region (72).
12. 12. A method according to any one of claims 1 to 3, characterized in that the visible area (71) is formed by one or more voids and/or hollows in the masking layer (22).
13. 13. A method according to any one of claims 1 to 3, characterized in that the one or more profiled elements (40) and the viewing area (71) and/or the screening area (72) are arranged in exact register with each other.
14. 14. A method according to any one of claims 1 to 3, characterized in that the registration tolerance between the one or more profiled elements (40) and the visible area (71) and/or the masking area (72) is in the range of 0.05 mm to 1.0 mm.
15. 15. A method according to any one of claims 1 to 3, characterized in that the registration tolerance between the decorative layer (21) and the visible area (71) and/or the masking area (72) is in the range of 0.1 mm to 0.4 mm.
16. 16. A method according to any one of claims 1 to 3, characterized in that the maximum registration tolerance between the one or more profiled elements (40) and/or the decorative layer (21) and/or the visible area (71) and/or the masking area (72) is in the range of 0.15 mm to 0.6 mm.
17. 17. A method according to any one of claims 1 to 3, characterized in that the transfer layer (2) is provided with at least one first protective layer (24).
18. 18. A method according to any of claims 1 to 3, characterized in that the carrier layer (3) has a degree of stretching until tearing in the range of 110 to 135% and/or has a tensile strength in the range of 15 kpsi to 50 kpsi and/or has an elastic modulus in the range of 100 kpsi to 1000 kpsi.
19. 19. A method according to any one of claims 1 to 3, characterized in that the carrier layer (3) is provided with a coating on at least one main face of the carrier layer, said coating being selected from one or more of the group consisting of polyacrylates, polymethacrylates, polyurethanes, polyesters, polyethers, polyolefins, epoxy resins and/or derivatives of the aforementioned components.
20. 20. A method according to any one of claims 1 to 3, characterized in that the transfer film (1) is provided with a primer layer (23).

Description

Transfer film, plastic injection molded part and method for producing same Technical Field The invention relates to a transfer film, a plastic injection molded part and a method for the production thereof. Background It is known to embed decorative films in injection molding in IMD processes and to post-mold with a plastic mass. The decorative film has a shape complementary to the injection mold when post-injection molded. After the post-injection molding, the carrier layer of the decorative film is withdrawn. It is also known to introduce surface structures into the surface exposed thereby. However, the transformation of the shape to be produced requires a transformation injection mold, and the surface structure is not arranged in precise register with respect to the decoration of the decorative film. Disclosure of Invention The object of the present invention is therefore to specify a transfer film and a plastic injection molded part coated with a transfer film having improved properties, in particular improved decorative and/or functional properties, and an improved method for the production thereof. This object is achieved by a method for producing a transfer film, in particular an IMD transfer film (imd=in-mold decoration). In this method, the following steps are performed, in particular in the order given: a) A carrier layer is provided which is arranged such that, B) Providing a transfer layer comprising a decorative layer, wherein the transfer layer is or is to be arranged on the carrier layer, C) One or more molding elements are applied to the carrier layer, wherein the one or more molding elements have a three-dimensional shape and are applied in precise register with the decorative layer. This object is also achieved by means of a transfer film, in particular an IMD transfer film. The transfer film is preferably manufactured by means of the method according to the invention. The transfer film has a carrier layer and a transfer layer comprising a decorative layer, wherein the transfer layer is arranged on the carrier layer. Furthermore, the transfer film comprises one or more profiled elements, wherein the one or more profiled elements are applied on the carrier layer and are precisely registered with respect to the decorative layer. The object is also achieved by a method for producing a plastic injection molded part which is coated with a transfer film, in particular an IMD transfer film. The transfer film is preferably produced according to the method according to the invention for producing a transfer film and/or the transfer film according to the invention. The method for producing a plastic injection molded part comprises the following steps, in particular in the order given: x 1) providing a transfer film, wherein the transfer film has a carrier layer and a transfer layer comprising a decorative layer, wherein the transfer layer is or is to be arranged on the carrier layer, X 2) providing one or more profiled elements on the carrier layer, wherein the one or more profiled elements have a three-dimensional shape and are applied in precise register with respect to the decorative layer, X 3) injection molding the transfer film after injection molding, wherein the three-dimensional shaped molding of the one or more molding elements is introduced in precise register with respect to the decorative layer by the action of the injection molding compound on the transfer film in the transfer layer. The method for producing plastic injection molded parts is therefore in particular an IMD injection molding method. The object is also achieved by a plastic injection molding. The plastic injection-molded part is produced in particular by the method according to the invention for producing a plastic injection-molded part. The plastic injection molded part comprises a transfer layer of injection molding material and a transfer film, in particular an IMD transfer film, which is injection molded after injection molding. The transfer film is produced in particular by the method according to the invention for producing a transfer film and/or the transfer film according to the invention. The transfer layer comprises a decorative layer and has a three-dimensionally shaped molding, wherein the molding is introduced in precise register with respect to the decorative layer. The three-dimensionally shaped molding part is thus not particularly limited to the shape of the mold halves of the injection molding machine. The molding is preferably a molding which is additionally introduced in the form of a transfer layer which is produced by a mold half against which the carrier layer and/or the molding element or elements rest when the transfer film is post-injection molded with the injection molding compound. In particular, it is achieved thereby that the haptic elements and/or depth effects can be produced on the surface of the plastic injection molding. In addition, it is achieved that the haptic elements and/or depth ef